The Motorola Olympus has been rumored for some time now, and it is Moto's next generation handset for AT&T. It has a Tegra 2 dual core processor running at 1 GHz. The device is rumored to have a 4.3 inch screen and that's all that is known so far. Interestingly this would be Motorola's first high-end device on a carrier other than Verizon, though a Verizon twin nicknamed Etna has also been rumored.
Android Central states: We've independently heard that the Olympus definitely is in testing on AT&T, with a 4-inch screen with 480 x854 resolution.
Source: Android Central